Diablo premium 5 in 220 grit universal, 12-hole random orbital sanding (ROS) discs with hook-and-lock backing include breakthrough innovations that improve performance, extend sanding life and increase productivity. Featuring a premium ceramic blend, these discs remove material faster than other sanding discs and offer an extra-long sanding life. Clog-Shield, Diablo own blend of grinding agents, reduces loading thus maximizing productivity. The great grain bonding system, Endura-Bond, provides Diablo sanding discs with longer life and extreme durability.